Footwear liner



FIG. 1 is an environmental perspective view of a footwear liner showing my new design;

FIG. 2 is an environmental top plan view thereof; and,

FIG. 3 is an environmental front elevational view thereof.

The broken line showing of a portion of the footwear liner is for illustrative purposes only, merely disclosing the types of footwear liners which may be used, and forms no part of the claimed design. 

The ornamental design for a footwear liner, as shown and described. 